JPH0443193B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field to which the Invention Pertains] The present invention provides a crucible-type induction furnace that efficiently eliminates soot and smoke generated during melting of metal to keep the inside and outside of the furnace body clean, and to keep the inside and outside of the furnace body clean. The present invention relates to a dust collection and heat retention device that prevents heat dissipation within a furnace body during heat retention and reduces power consumption for heat retention.

[Prior art and its problems]

In order to eliminate soot and smoke that is generated when metal is melted in a crucible-type induction furnace, an annular hood with a hollow cross section equipped with an exhaust fan is placed above the upper end of the furnace body, with an appropriate gap between the hood and the furnace body. At the same time, a lid larger than the inner circumference of the hood is placed above the hood with an appropriate gap between the hood and the hood. The soot and smoke were inhaled and expelled along with the outside air sucked in through the gap between the furnace body and lid. In order to prevent the hood from being damaged by thermal deformation during the heat retention of the molten metal in the furnace body, outside air is sucked in to cool the hood in the same way as when exhausting smoke.

This structure has the disadvantage that when keeping the molten metal warm, the heat of the molten metal is taken away by the exhaust gas either directly or through the hood, which increases the electric power required to keep the molten metal warm.

[Purpose of the invention]

In order to eliminate the above-mentioned drawbacks, the present invention has developed a crucible-type induction furnace that is capable of efficiently eliminating soot and smoke generated as a result of melting metal, and preventing heat dissipation within the furnace body when keeping the temperature of the molten metal. The purpose is to provide a dust collection and heat retention device.

[Key points of the invention]

In order to achieve the above object, the present invention includes a lid having an outer circumferential dimension slightly larger than an inner circumferential dimension of the upper end opening in order to open and close the upper end opening of the crucible-shaped furnace body, and a lid having an outer circumferential dimension slightly larger than the inner circumferential dimension of the upper end opening, and An annular hood having a mouth and integrally formed on the outer periphery of the lid so that the lower surface is located slightly higher than the lower surface of the lid, an exhaust means connected to the hood, and a means for moving the lid. This is something I prepared for.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the invention.
This figure shows the state when the molten metal 1 is being kept warm. An induction heating coil 3 is wound around the outer periphery of a crucible-shaped furnace body 2 made of a refractory material such as alumina.
Molten metal 1 heated to a high temperature and melted by electromagnetic induction is stored in a furnace body 2 while keeping it warm, and is tapped out as needed. A disk-shaped lid 4 is provided on the upper end surface of the furnace body 2 to open and close the opening, and the lid 4 is formed by lining a frame 4a made of an iron plate with a refractory material 4b such as alumina. ing. As is clear from the figure, this lid 4 has an outer circumference slightly larger than the inner circumference of the upper end opening of the furnace body 2, and an annular hood 5 with a hollow rectangular cross section is integrally attached to the outer circumference. The hood 5 is connected to exhaust means such as an exhaust fan, an exhaust duct, etc. (not shown). The bottom surface of the hood 5 is the furnace body 2
A plurality of air intake ports 5a are provided in the circumferential direction on the lower surface of the air inlets 5a. The lid 4 can be opened and closed by moving vertically using a moving means (not shown).

According to the embodiment, the molten metal 1 in the furnace body 2 is kept warm by sealing the opening of the furnace body 2 with the lid 4, effectively preventing heat dissipation, thereby reducing the electric power required for keeping it warm. be able to. The exhaust fan is also operated during this heat retention, thereby allowing the air to pass through the gap G between the lower surface of the hood 5 and the furnace body 2 and the air inlet 5a.
The hood 5 is cooled with external air sucked from the hood 5 to prevent damage to the hood 5 due to thermal deformation.

When melting metal, the lid 4 is moved by a moving means above the furnace body 2 as shown in FIG. 2 to open the opening of the furnace body 2, and the exhaust fan is operated. In this state, the outside air sucked in from the intake port 5a through the gap between the bottom surface of the hood 5 and the furnace body 2, as well as the soot and smoke generated as a result of metal melting, are sucked into the hood 5 and eliminated. You can keep the inside and outside clean.

〔Effect of the invention〕

According to this invention, in order to open and close the upper end opening of the crucible-shaped furnace body, the lid has an outer circumferential dimension slightly larger than the inner circumferential dimension of the upper end opening, and the lower surface has an air intake port on the lower surface. An annular hood integrally formed on the outer periphery of the lid such that the hood is positioned slightly higher than the lower surface of the lid, an exhaust means connected to the hood, and a means for moving the lid, When melting metal, by moving the lid above the furnace body and opening the furnace body, the hood efficiently removes the soot and smoke generated during melting, keeping the inside and outside of the furnace clean. When keeping the molten metal warm, by sealing the opening of the furnace body with a lid, it is possible to prevent the dissipation of the heat of the molten metal and reduce the power required for keeping the metal warm.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the embodiment of the present invention during heat retention, and FIG. 2 is a longitudinal sectional view of the embodiment of FIG. 1 during dissolving smoke exhaustion. 2...furnace body, 4...lid, 5...hood, 5a
...Intake port.

Claims (1)

[Claims] 1. A lid having an outer circumference slightly larger than the inner circumference of the upper opening in order to open and close the upper opening of the crucible-shaped furnace body, and an air intake port on the lower surface, the lower surface being the lower surface of the lid. A crucible-shaped induction device comprising: an annular hood integrally formed around the outer periphery of the lid so as to be positioned slightly higher; an exhaust means connected to the hood; and a means for moving the lid. Furnace dust collector.